Insole and the manufacture thereof



Aug. 11,1936.

Filed June 25, 1934 Patented Aug. 11, 1936 UNITED STATES PATENT OFFICE INSOLE AND THE MANUFACTURE THEREOF Application June 25, 1934, Serial No. 732,239

9 Claim.

This invention relates to improvements in insoles and is illustrated herein as embodied in a lipped insole reinforced with a fabric the threads of which consist at least in part of a readily soluble cellulose derivative, the fabric being stuck to the insole by cement formed by the action of a suitable solvent on said readily'soluble mate- .rial.

In the drawing, v

Fig. 1 is a perspective view of a lipped or ribbed insole prior to the application of the reinforcing fabric thereto; and

' Figs. 2 and 3 are perspective views of the insole after the reinforcing fabric has been applied to it.

The insole III, as shown in Fig. 1, has been channeled exteriorly as shown at I! and in- -'teriorly asshown at H, after which the channel flaps have been turned up and cemented together to form the lip or rib l6 extending pcripherally of the insole substantially parallel to its edge from about the heel breast line forwardly around the toe of the insole and back to the heel breast line at the other side in a manner which will be familiar to every one who is acquainted -with.the insoles commonly used in the manufacture ofGoodyear welt shoes. Such insoles are commonly, though not; necessarily, made of leather ,and are often reinforcedwith a sheet of canvas or duck cemented to the surface of the insole bounded by the lip and to the inner surface of the lip. In accordance with my invention the insole is reinforced with.a sheet of fabric, indicated at IS in Fig. 2 and in a differentjorm at 20 in Fig. 3, consisting, at least in part, of a cellulose derivative that is readily soluble in a suitable solvent which, by acting on the cellulose derivative, forms cement. For example, and as shown in Fig. 2, the threads of the fabric (both warp and woof) are spun from fibres part of which consist of cellulose acetate, cellulose nitrate, or other readily soluble ester or ether, and part of which consist of substantially insoluble fibres such as cotton. Sucha fabric may be treated with an organic solvent for the soluble threads, for example acetone, or a mixture of acetone with amyl acetate or propylene oxide, either with or without dlsby the lip and against the inner surface of the lip. After the cement formed by the action of the solvent on the soluble threads has dried, the surplus material projecting beyond the lip may be trimmed oil in any suitable manner. If desire'd, the solvent may be applied to the insole instead of to the fabric. If this is done, it is preferable to use a solvent containing suflicient dissolved cellulose nitrate or cellulose acetate so that it will tend pretty definitely to stay in place on the insole. Then the fabric, which may but need not also have been treated with solvent, may be pressed into place, as previously described.

An insole embodying my invention, tending to rather greater longitudinal flexibility, is illustrated in Fig. 3. In this construction the hreads 22 running transversely of the insole all consist of cotton or other relatively insoluble fibres, while the threads extending lengthwise consist entirely of soluble materiahpreferably cellulose 20 acetate or other cellulose ester or ether. When such a fabric is applied to the insole, either the fabric or the insole or both having been treated with a suitable solvent, the lengthwise extending soluble threads disappear completely, leaving the 25 transversely extending threads cemented to.the insole by cement formed by the dissolving of the soluble threads. Since'there are no lengthwise extending threads, the reinforcement of this insole has little tendency to stiffen the insole against lengthwise bending. the stiffening that results from the transversely extending threads is in no way disadvantageous.

While my invention is disclosed herein as embodied in a lipped or ribbed insole, it is to be understood that'it is in no way limited in its utility to such an insole. Obviously the invention may also be embodied in the non-lipped type of insole used in the manufacture of throughand-through stitched and compo shoes.

Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States is': 1. An insole reinforced over the major portion of its area with material comprising substantially insoluble threads running transversely of the insole but with no such threads running lengthwise of the insole and cellulose derivative cement by which the transverse threads are stuck to the surface of the insole. s

2. An insole reinforced over the major portion 1 of its area with material consisting of threads all of which are substantially parallel and a cellulose derlvative by which the threads are stuck to the surface of the insole.

On the other hand, v

lip and the surface of the insole bounded by the lip being reinforced by a sheet of fabric the material of which consists in part of cellulose acetate, said fabric being stuck to the insole by cement formed from the cellulose acetate of the fabric.

6. That improvement in methods of reinforcing insoles which comprises treating with a solvent a sheet of fabric the threads of which consist at least in part of material readily soluble in and capable of forming cement upon treatment with said solvent, and applying the treated fabric to the surface of an insole.

'7. That improvement in methods of reinforcing insoles which comprises treating a sheet of fabric the threads of whichconsist at least in part of material readily soluble in and capable of forming cement upon treatment with a suitable solvent with such asolvent, and applying the treated fabric to the area bounded by the lip of a iippedinsole.

8. That improvement in'methods of reinforcing insoles which comprises treating a sheet of fabric the threads of which consist at least in part of a. cellulose ester with a solvent therefor, and pressing the treated fabric against the lip and the area bounded by the lip of a lipped insole.

9. That improvement in methods of reinforcing insoles] which-comprises treating a sheet of fabric the threads of which consist at least in part of cellulose acetate with a solvent therefor, and applying the treated fabric to' and pressing it against the inner face of the lip and the area bounded by the lip of a lipped insole.

MAX W. TE'I'LOW. 

